Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1970-1974  (2)
  • 1971  (2)
  • Inorganic Chemistry  (2)
  • General Chemistry
  • preparation
Material
Years
  • 1970-1974  (2)
Year
Keywords
  • Inorganic Chemistry  (2)
  • General Chemistry
  • preparation
  • Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 220-227 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: cis- and trans-3.3′-Dimethoxy-5.5′-di-tert-butyldiphenoquinone-(4.4′)The two geometric isomers of 3.3′-dimethoxy-5.5′-di-tert-butyldiphenoquinone-(4.4′) (1) were isolated. The configurational assignment was made on the basis of n.m.r. spectra and the X-ray diffraction pattern from single crystals. The free enthalpy of activation for the cis/trans-isomerisation was determined. -p-Diphenoquinones with different substituents in both rings, which were needed as model compounds, could be prepared for the first time.
    Notes: Die beiden geometrischen Isomeren des 3.3′-Dimethoxy-5.5′-di-tert.-butyl-diphenochinons-(4.4′) (1) wurden isoliert. Die Konfigurationszuordnung gelang anhand der NMR-Spektren sowie von Einkristall-Röntgenaufnahmen. Die Freie Aktivierungsenthalpie der cis/trans-Isomerisierung wurde bestimmt. -p-Diphenochinone mit verschiedenen Substituenten in beiden Ringen, als Vergleichssubstanzen benötigt, konnten erstmals dargestellt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 146-159 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tc2O7 crystallizes in the orthorhombic space group Pbca with a = 13.756, b = 7.439, c = 5.617 Å, Z = 4. The single crystal structure analysis shows the crystals to contain isolated centrosymmetric Tc2O7 molecules with a linear central Tc—O—Tc bridge and with, tetrahedral coordination of the Tc atoms. Tc—O bond lengths: 1.840 (bridge), 1.658, 1.684 and 1.706 Å. The structure is more closely related to CrO3, RuO4 and OsO4 than to Re2O7.Structural properties of the d° transition metal oxides are briefly discussed.
    Notes: Tc2O7 kristallisiert orthorhombisch mit a = 13,756, b = 7,439, c = 5,617 Å, Z = 4 in der Raumgruppe Pbca. Die vollständige Röntgenstrukturanalyse zeigt, daß im Kristall zentrosymmetrische Tc2O7-Molekeln mit tetraedrischer Koordination des Metalls und linearer Tc—O—Te-Brücke vorliegen. Tc—O-Bindungsabstände: 1,840 (Brücke), 1,658, 1,684 und 1,706 Å.Damit sind Struktur und Koordinationsverhältnisse der Kettenstruktur des CrO3 und den Molekülstrukturen von RuO4 und OsO4 ähnlicher als der polymeren Schichtstruktur des Re2O7.Struktureigensehaften von d°-Übergangsmetalloxiden werden kurz im Zusammenhang diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...